package com.company;
//anthor:XM YQL

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        // write your code here
        Scanner input = new Scanner(System.in);
        System.out.println("qingshurubanjing:");
        double radius = input.nextDouble();
        yuan yuan = new yuan(radius);
        yuan.show();

    }
}
